It is a congruent number.
It is an unprimeable number.
Almost surely, 2221760120 is an apocalyptic number.
221760120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 221760120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334172160).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
221760120 is a wasteful number, since it uses less digits than its factorization.
221760120 is an evil number, because the sum of its binary digits is even.
The square root of 221760120 is about 14891.6124043033. The cubic root of 221760120 is about 605.2867251899.
The spelling of 221760120 in words is "two hundred twenty-one million, seven hundred sixty thousand, one hundred twenty".